锥形束计算机断层扫描和多排螺旋计算机断层扫描在中面部诊断成像中的性能：对 Phantom 和尸体头部扫描的比较研究。
Performance of cone-beam computed tomography and multidetector computed tomography in diagnostic imaging of the midface: A comparative study on Phantom and cadaver head scans.
机构信息
Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg, Martinistrasse 52, D-20246, Hamburg, Germany.
Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Oberdürrbacher Straße 6, D-97080, Würzburg, Germany.
出版信息
Eur Radiol. 2017 Feb;27(2):790-800. doi: 10.1007/s00330-016-4387-2. Epub 2016 May 11.
PURPOSE
To compare multidetector computed tomography (MDCT) and cone-beam computed tomography (CBCT) regarding radiation, resolution, image noise, and image quality.
METHODS
CBCT and 256-MDCT were compared based on three scan protocols: Standard-dose (≈24 mGy), reduced-dose (≈9 mGy), and low-dose (≈4 mGy). MDCT images were acquired in standard- and high-resolution mode (HR-MDCT) and reconstructed using filtered back projection (FBP) and iterative reconstruction (IR). Spatial resolution in linepairs (lp) and objective image noise (OIN) were assessed using dedicated phantoms. Image quality was assessed in scans of 25 cadaver heads using a Likert scale.
RESULTS
OIN was markedly higher in FBP-MDCT when compared to CBCT. IR lowered the OIN to comparable values in standard-mode MDCT only. CBCT provided a resolution of 13 lp/cm at standard-dose and 11 lp/cm at reduced-dose vs. 11 lp/cm and 10 lp/cm in HR-MDCT. Resolution of 10 lp/cm was observed for both devices using low-dose settings. Quality scores of MDCT and CBCT did not differ at standard-dose (CBCT, 3.4; MDCT, 3.3-3.5; p > 0.05). Using reduced- and low-dose protocols, CBCT was superior (reduced-dose, 3.2 vs. 2.8; low dose, 3.0 vs. 2.3; p < 0.001).
CONCLUSION
Using the low-dose protocol, the assessed CBCT provided better objective and subjective image quality and equality in resolution. Similar image quality, but better resolution using CBCT was observed at higher exposure settings.
KEY POINTS
• The assessed CBCT device provided better image quality at lower doses. • Objective and subjective image quality were comparable using higher exposure settings. • CBCT showed superior spatial resolution in standard-dose and reduced-dose settings. • Modern noise-reducing tools are used in CBCT devices currently. • MDCT should be preferred for assessment of soft-tissue injuries and oncologic imaging.
目的
比较多层螺旋 CT（MDCT）和锥形束 CT（CBCT）在辐射、分辨率、图像噪声和图像质量方面的差异。
方法
基于三种扫描方案对 CBCT 和 256 层 MDCT 进行比较：标准剂量（≈24 mGy）、降低剂量（≈9 mGy）和低剂量（≈4 mGy）。MDCT 图像分别以标准和高分辨率模式（HR-MDCT）采集，并使用滤波反投影（FBP）和迭代重建（IR）进行重建。使用专用体模评估线对分辨率（lp）和客观图像噪声（OIN）。使用 25 具尸体头颅扫描评估图像质量，并采用李克特量表进行评分。
结果
与 CBCT 相比，FBP-MDCT 的 OIN 明显更高。仅在标准模式 MDCT 中，IR 可将 OIN 降低至可比较的值。CBCT 在标准剂量时提供 13 lp/cm 的分辨率，在降低剂量时提供 11 lp/cm 的分辨率，而 HR-MDCT 则分别提供 11 lp/cm 和 10 lp/cm 的分辨率。在低剂量设置下，两种设备均能实现 10 lp/cm 的分辨率。标准剂量时 MDCT 和 CBCT 的质量评分无差异（CBCT，3.4；MDCT，3.3-3.5；p>0.05）。使用降低剂量和低剂量方案时，CBCT 具有优势（降低剂量，3.2 比 2.8；低剂量，3.0 比 2.3；p<0.001）。
结论
使用低剂量方案，评估的 CBCT 提供了更好的客观和主观图像质量，且在分辨率方面具有同等水平。在更高的曝光设置下，使用 CBCT 可获得类似的图像质量，但具有更好的分辨率。
关键点
评估的 CBCT 设备在较低剂量下提供了更好的图像质量。
在较高的曝光设置下，客观和主观图像质量相当。
CBCT 在标准剂量和降低剂量设置下具有更高的空间分辨率。
现代降噪工具目前已应用于 CBCT 设备中。
MDCT 应优先用于软组织损伤和肿瘤成像的评估。
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